THROW-AWAY TIP COATED WITH DIAMOND

摘要

PURPOSE:To provide a diamond-coated throw-away tip having long life and capable of giving an excellent working face. CONSTITUTION:The objective diamond-coated throw-away tip of the present invention has a diamond coating film on at least a part of the surface of a substrate made of a hard material. The surface excluding the tip bearing face is composed of a diamond coating layer and a substrate having a surface roughness of <=0.8S. Especially preferably, a diamond coating layer is extended from the top of the cutting face toward the bearing at a length of >=0.2mm. Since the substrate also has smooth surface, an excellent working face can be obtained and the peeling, etc., of the diamond coating layer can be suppressed to prolong the life of the tip.